Improvement in curtain-fixtures



N.17o'.ooe.

W.I H. MAINE.

CURTAIN-FIXTURES.

` Patented Nov.16, 1875.

LTNI'rED ASTATES PATENT OFFICE.

WILLIAM H. MAINE, OF ABINGTON, MASSACHUSETTS.

IMPRovEMl-:NT IN CURTAIN-FIXTURES.

Specification forming part of Letters Patent No. 170,006, dated November16, 1875; application tiled October 16, 1875.

T o all whom it may concern:

Be it known that I, WILLIAM H. MAINE, of Abington, Plymouth county,Massachusetts,

` have invented a new and Improved Curtain- Roller, of which thefollowing is a specilication:

Figurel represents a vertical central section of my improved curtainroller, and Fig. 2 a detail end view ofthe locking-cam sleeve asdetached from the roller. f

Similar' letters oi' reference indicate correspondin g parts.

The present invention relates to that class of spring curtain-rollerswhich are provided with a device for preventing the unwinding of thespring when the roller is removed from the brackets. I I

rlhe invention consists ot' a spring-roller with stationary cam-sleevesocketed to the end in connection with a loose pin sliding in a hole ofthe spindle or shaft, for engaging the cam-sleeve at the instant whenthe spindle is taken out of the bracket.

In the drawing, A represents a spring curtain-roller, ofthe usualconstruction, which is provided at the end with a metallic camsleeve, B,set securely by an outer collar or rim, and raised ribs a into the capor end piece of the roller. The earn-sleeve B lits loosely, by aninterior collar, on the shaft or spindle C ot' the roller, the shaftbeing rigidly held in position in the customary manner, `by itsflattened end, when seated in the supporting-bracket. rlhe cam-sleeve Bis formed at the interior with one or more recesses and teeth, d,against which a conically-tapering pin, I), that slides in acorresponding hole of the spindle at a point within the cam-sleeve, isthrown by centrifugal force, imparted by the sudden rotation of thespindle when being taken out of the bracket. The pin D is loosely ittedinto the'hole of the spindle, and retained therein when the roller isplaced in position on the brackets, by being seated vertically in thehole, with the larger end at the top, so that the roller and cam-sleevecan clear the pin and revolve without obstruction. The pin is soarranged in the spindle that it assumes a vertical position when theroller is placed in the brackets.

Assoon as the roller is taken out of the bracket, the spiralroller-spring. actson the spindle, revolves the same, and throws the pininstantly out ot' its seat against a cam of the sleeve, so as to retainthe spindle and prevent the unwinding of the spring. The roller thusremains in locked position as long as it is out of the brackets, and isinstantly available for use when replaced in the brackets.

Having thus described my invention, I claim as new and desire to secureby Letters Patent A 1. As an improvement in spring curtainrollers, theimproved spindle-locking device, consisting of a curtain-roller withfixed camsleeve at the end, in combination with a sliding pin seated ina perforation of the spindle within the sleeve, to arrest the spindlewhen the roller is detached Vfrom the supportingbracket, substantiallyas specified.

2. The spindle ofa spring curtain-roller, provided with a guide-hole forthe sliding locking-pin at a point within the cain-sleeveof the roller,the pin-hole being in vertical position when the spindle is seated inthe brackets, substantially as specified.

WILLIAM H. MAINE.

Witnesses:

NATHANIEL H. STEvENsoN, STEPHEN TEACHER.

